Path: utzoo!attcan!uunet!wuarchive!psuvax1!rutgers!cbmvax!ken
From: ken@cbmvax.commodore.com (Ken Farinsky - CATS)
Newsgroups: comp.sys.amiga.tech
Subject: Re: FileInfoBlock
Keywords: FileInfoBlock write protection date
Message-ID: <15413@cbmvax.commodore.com>
Date: 26 Oct 90 14:29:48 GMT
References: <phil.656904446@adam.adelaide.edu.au>
Reply-To: ken@cbmvax.commodore.com (Ken Farinsky - CATS)
Distribution: comp
Organization: Commodore, West Chester, PA
Lines: 56

In article <phil.656904446@adam.adelaide.edu.au> phil@adam.adelaide.edu.au (Phil Kernick) writes:
>If I use the following stub of code:
>
>getinfo()
>{
>  BPTR fred;
>  struct FileInfoBlock *fib;
>
>  lock = Lock("fred", ACCESS_READ);
>  Examine(lock, fib);
>}

AACK!!  You have to allocate the memory for the file info block.

something like:

if (NULL != (fib = (struct FileInfoBlock *)
             AllocMem(sizeof(*fib),MEMF_CLEAR | MEMF_PUBLIC)))
    {
    /* use the fib here */
    FreeMem(fib, sizeof(*fib));
    }

Note that AllocMem() guarantees longword alignment.  Sorry for any
errors, I'm doing this from memory.  Here's the info on Examine():

    SYNOPSIS
        success = Examine( lock, infoBlock )
        D0                 D1    D2

        BOOL success;
        struct FileLock *lock;
        struct FileInfoBlock *infoBlock

    FUNCTION
        Examine() fills in information in the FileInfoBlock concerning the
        file or directory associated with the lock. This information
        includes the name, size, creation date and whether it is a file or
        directory. FileInfoBlock must be longword aligned. Examine() gives
        a return code of zero if it fails.

        You may make a local copy of the FileInfoBlock, as long as it is
        never passed back to the operating system.

    INPUTS
        lock - BCPL pointer to a lock
        infoBlock - pointer to a FileInfoBlock (must be longword aligned)

    OUTPUTS
        success - boolean

-- 
--
Ken Farinsky - CATS - (215) 431-9421 - Commodore Business Machines
uucp: ken@cbmvax.commodore.com   or  ...{uunet,rutgers}!cbmvax!ken
bix:  kfarinsky